Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31ef1e843dfb912641852e812f5942b651a51ad57ff6582b2dcd3add879fef0' 
  AND token = '3I9nZqluz8GPg8SrQ7sPyEv9kA4nW+UuMtZMpM1AWNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}